Kevin Versace said on 09/26/2006:
Sound quality is great under the hood while the engine is running. There is no interference through the PA even if your CB radio has noise/static.
Switch your CB's option from "CB" to "PA," turn your CB's volume all the way down but leave your CB on (of course), and speak into your mic. It doesn't matter what CB channel you're on. And, with my Cobra 29WXNWST, I could control the volume of my voice with my RF Gain knob.